refactor(picker): remove unused custom property

Remove unused custom property picked up by stylelint.

Author: jawinn

components/picker/index.css

@@ -32,7 +32,6 @@ governing permissions and limitations under the License.
 	--spectrum-picker-spacing-bottom-to-text: var(--spectrum-component-bottom-to-text-100);
 	--spectrum-picker-spacing-edge-to-text: var(--spectrum-component-edge-to-text-100);
 	--spectrum-picker-spacing-edge-to-text-quiet: var(--spectrum-field-edge-to-text-quiet);
-	--spectrum-picker-spacing-top-to-text-side-label-quiet: var(--spectrum-component-top-to-text-100);
 	--spectrum-picker-spacing-label-to-picker: var(--spectrum-field-label-to-component);
 
 	--spectrum-picker-spacing-text-to-icon: var(--spectrum-text-to-visual-100);
@@ -89,7 +88,6 @@ governing permissions and limitations under the License.
 .spectrum-Picker--sizeS {
 	--spectrum-picker-font-size: var(--spectrum-font-size-75);
 	--spectrum-picker-block-size: var(--spectrum-component-height-75);
-	--spectrum-picker-spacing-top-to-text-side-label-quiet: var(--spectrum-component-top-to-text-75);
 	--spectrum-picker-spacing-top-to-text: var(--spectrum-component-top-to-text-75);
 	--spectrum-picker-spacing-bottom-to-text: var(--spectrum-component-bottom-to-text-75);
 	--spectrum-picker-spacing-edge-to-text: var(--spectrum-component-edge-to-text-75);
@@ -110,7 +108,6 @@ governing permissions and limitations under the License.
 .spectrum-Picker--sizeL {
 	--spectrum-picker-font-size: var(--spectrum-font-size-200);
 	--spectrum-picker-block-size: var(--spectrum-component-height-200);
-	--spectrum-picker-spacing-top-to-text-side-label-quiet: var(--spectrum-component-top-to-text-200);
 	--spectrum-picker-spacing-top-to-text: var(--spectrum-component-top-to-text-200);
 	--spectrum-picker-spacing-bottom-to-text: var(--spectrum-component-bottom-to-text-200);
 	--spectrum-picker-spacing-edge-to-text: var(--spectrum-component-edge-to-text-200);
@@ -131,7 +128,6 @@ governing permissions and limitations under the License.
 .spectrum-Picker--sizeXL {
 	--spectrum-picker-font-size: var(--spectrum-font-size-300);
 	--spectrum-picker-block-size: var(--spectrum-component-height-300);
-	--spectrum-picker-spacing-top-to-text-side-label-quiet: var(--spectrum-component-top-to-text-300);
 	--spectrum-picker-spacing-top-to-text: var(--spectrum-component-top-to-text-300);
 	--spectrum-picker-spacing-bottom-to-text: var(--spectrum-component-bottom-to-text-300);
 	--spectrum-picker-spacing-edge-to-text: var(--spectrum-component-edge-to-text-300);